Turtle - TypeDefinition/NautiBuoy GitHub Wiki

Turtle enemy:

• Moves in one direction and when it collides onto a wall moves the opposite direction
• When player is on the same x or y axis as it, it will 'charge up', face the player, hide in its shell and start spinning in the direction of the player.
• It cannot change direction once it is spinning, when it collides into a wall, it moves in the opposite direction.
• When it is in its shell, it its invincible to player's default bullets.

Turtle states:

• Idle state
• Charge up state
• Attack state
• Rest state
• Idle -> (player on same x or y axis) -> charge up -> (after a few frames) -> attack and start spinning -> (after a few frames) -> Rest -> (after a few frames) -> Idle

Idle state

• Moves in one direction and when it collides onto a wall moves the opposite direction.
• During idle state, it will check whether player is on the same x or y axis to trigger the change to charge up state and subsequently the attack state.

Charge up state

• Will face the player and move a little bit towards player.
• Has a small two-frame animation of it hiding into its shell when it's getting closer to attack state.
• After a few frames change to attack state

Attack state

• Will hide in its shell and spin around.
• Moves in one direction (the direction it initially sensed where the player was) and when it collides onto a wall moves the opposite direction.
• The turtle is invulnerable in this state.
• After a while, change to rest state.

Rest state

• Similar to idle mode except it does not check the conditions for charge up state and attack state.
• After a few frames return back to idle state.